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@ARTICLE{Weber:836132,
      author       = {Weber, Juliane and Barthel, Juri and Klinkenberg, Martina
                      and Bosbach, Dirk and Kruth, Maximilian and Brandt, Felix},
      title        = {{R}etention of $^{226}${R}a by barite: {T}he role of
                      internal porosity},
      journal      = {Chemical geology},
      volume       = {466},
      issn         = {0009-2541},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-05255},
      pages        = {722-732},
      year         = {2017},
      abstract     = {The role of internal macropores and nano-scale pores for
                      the uptake of 226Ra into barite was studied via scanning and
                      transmission electron microscopy as well as focused ion beam
                      methods. A temporal evolution of the internal microstructure
                      and the Ra distribution was observed on samples taken from
                      long-term Ra uptake experiments. The results of this study
                      clearly show a significant impact of the presence of Ra
                      leading to a complete reconstruction of the internal barite
                      microstructure, whereas the microstructure of Ra-free
                      reference samples remained unchanged. The initial internal
                      barite microstructure contains a connected network of
                      macropores and a layered structure of nano-scale pores
                      which, in the presence of Ra, coalesced in favor of larger
                      pores during the experiment. A clear relationship between
                      the Ra uptake and the internal porosity was observed by
                      high-resolution STEM-EDX mappings. Starting from strongly
                      enhanced Ra concentrations in the solid in the vicinity of
                      the pores, Ra is temporarily inhomogeneously distributed
                      within the barite particles. At later stages of the
                      long-term experiment the Ra distribution becomes homogenous
                      while nano-scale and macro-scale pores disappear. In
                      conclusion, the uptake of Ra into barite takes place by a
                      special case of dissolution/reprecipitation from the inside
                      of the particle to the outside.},
      cin          = {IEK-6 / ER-C-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-6-20101013 / I:(DE-Juel1)ER-C-2-20170209},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-161 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000407861200057},
      doi          = {10.1016/j.chemgeo.2017.07.021},
      url          = {https://juser.fz-juelich.de/record/836132},
}